Printing press



Dec. 1, 1925 w. H. SMITH PRINTING PRESS Filed Ply :517,*1922 l -2 Sheets-sheet 1 IN VEN TUR.

Dec. l. l925- 1,563,449

w. H. SMITH PRINTING PRESS med myA 1v. 1922 a sheets-sheet 2 Patented Dec. 1, 1925.

UNITED STATES WALTER H. SMITH, OF PITTSBURGH, PENNSYLVANIA, ASS[( `r1\TOR` TO MILLER SAVI- PATENT OFFICE.

TRIMMER COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

PRINTING PRESS.

Application liled .July 17,

To all `w/wm it may concern.

.Be it known that l, iV-imam lil. Sarria-1, subject oi' the King of Great Britain, residing at Pittsburgh, in the county ot Aliegliienv and State of Pennsylvania, have invented .new and useful Improvements in .Printing Presses, oit' which the following is a speeiiication.-

My invention pertains to cylinder print'1 `ing presses, and has as its principal object the provision ot a printing press in which. a high degree of accuracy may be obtained in the rolling contact between the impression member and the printing member, without exceptional cost of manufacture.

I have described. in the following specifi cation, and shown 'In the accompanying drawings, my invention as employed in conneetion with a printing press ot the type disclosed iu Letters Patent et the linited States No. hli'e granted. Jaimary lll, 191.6 on. the application. ol Swan Smith and Usi-ar W. Hammerquist.

In the drawings:

Fig, l. is a view in vertical'section of a pressof the type disclosed in the said patent issued to Smith and .llainmerquistg Fig. 9. is a side elevation of the same, showing the parts in a ditl'erent posi ion;

Fig. il is an end view, looking :from the le'l.t-lialid side o'l" Fig. 2; and

l `ig. l; is a detail of a gear wheel carried by the press cylinder.

press ot the type described in the said. Smith and Hannnerquist patent comprises a lirame l() provided at its upper part with slideways ll in which are mounted reciprocating blocks l2. The cylinder "ii-l is jourw naled in these blocks, and has a reciprocating movement imparted to it. as well as a rontinlums rotating movement in one ilireclion. The press 'iframe also has mounted. therein, so as to be capable oi a vertical reciprocating movement, supporting.;` slides lat, on which reciprocates the type bed Aas lhc hed l5 moves towards the left, the cylinder moves over it to the right Fig. l), thus performing the printing operation. l'rior to the return movement of the bed, the supporting slides let are lowered, whereby the bed makes its return movement on a lower plane, out of contact with the cylinder if?) as the latter returns in the opposite direction. The construction is such that the bed and 1922. Serial No. 575,517.

cylinder have a dwell at each end ol their rccii'n'ocating movement. During the dwell at one end the sheet is fed to the cylinder, and during the dwell at the other end the sheet is delivered trom the cylinder.

The recilnrocaticn oit the cylinder' 'l-l is etiiected by means of a cam segment jlt secured to a rock shaft Illr and actuated by a double-faced cam 19, each face of the said cam 19 operating upon a cam roller 2O carried by the segment 16. The rock shalt l? is connected by levers 2l and connecting rods 22 with the reciprocable blocks l2 in which the cylinder has its bearings. As will be seen7 the faces ot' the cam li) are so formed as to cause the reeiprocation ot the cylinder, and provide the dwell, above re- 'l'erreifl to, at each end of the stroke.

The reciprocation ot the type bed l5 also is effected by the segment 1G, which carries an arm 25:3 linked to a bell-crank. lever 241, which, in turn, is connected to the bed l5 by means of an adjustable connecting rod The raising and lowering ot thel bed-supporting slides let is effected by an. internal cam 26 `which actuates one ol a pair ot pivoted levers 27, the free ends of which are normally connected by a bar 28. One of these levers is connected with a pair of eccentric arms 29 operating eccentrics 30. The eccentries l0 serve to raise or lower a pair ot vertically movable beams 3l, one on each side of the press, which beams larry standards 39. on which the bedsu1v3porting slide 14. is mounted. By means ot a pedal El?) the mechanism for actuating the supporting slide 14C may be thrown out oli' operation, so that the slide will not be raised during that particular cycle of the press, this being done for the usual throw-out purposes.

The press receives its power from a driven pulley 311, having thereon a pinion wl'iich meshes with a gear mounted on the press shaft 36. Meshing with the gear is an idler gear 36a, oi the same diameter, wh" h in turn meshes with a gear wheel 37 carried by the cylinder shaft 38. The idler gear 236 is supported by links 39 and Ll() extending respectively trom the cylinder shaft 38 and the press shaft 36.

It will be seen from the above that the cylinder rotates at all times in the .sa-me direction. As it moves. to the right, tor printing, it has a geared relation, by means of a partial gear. wheel el which it Carries, with a register rack' e2 Carried bythe hed. is raei iL-a is one enoi s a' l Th l 0 l igh o th t it will engage the par-tial; gear eti; somewhat before the.y bed Comes into actual printingv relation with the Cylinder, and 'for a short time after the bed has passed out of actual printing relation with the cylinder. This lap at eaeh end ensures a smooth engagement ot raek and gear during` the printingoper'- ation. The raek '1l-2 and partial gear il do not engage, o course when the hed is in its lowered position. Buring its dwell41 and subsequently when it moves to. the left' atter the printing ope "ation, the cylinder still continues to rotate in the saine direction as be'lore.

Since both the cylinder and the led l5,l with their interengaging gear it and raeli 2, are deiinitely driven by the abovedeserihed series of meel'ianieal' parts, and since the Cylinder is additionally definitely rotated by the train of' gears 35, 3G and 37, it is evident that a minute aeeuraey71 ohtainable only at Considerable expense., must be followed in the manufacture oit' these parts particularly the douhlef'aeed cam l), in order that the requiredv hi'gl'ily acc-rate rolling` Contact may he obtainedv Aeeording to my inventionl` l1 relieve the drivingl faQ-,es of those et the teeth of the gear wheelt 3T which will be in mesh with the idler gear 36 at the same time as the gear l-l is in engagement with the register racli ft2; ln thev construction showin this will. be about one-half of.v ther teeth of the rear wheel ils indicated` in Fig. l, this relieving of the teeth isgradual for the irst tew and last few of the series of teeth relieved. In Fig, 4t, the partially relieved teeth are indieated at and the fully. relieved teeth at C. The partially relieved teeth Z; will engage the'idler gear 36* at the time when the laps. of theraelr, one at each end' ot the part which operative. during actual printing engagement oit hed and' eylinder, are meshing' withthe partial gear ll.. then theinain part of' the'y rack 424 is in engagement with the partiall gli, i. e., during. the actual printing portionotl thel eye-le, they fully relieved. teeth, c et the gear whel, will be meshing with the idler gear 36a, although notfdriven by the latter. In short, the faces of the teeth of the gear wheel 37 are relieved in. such a. manner that the partial gear il will' be accurately and smoothly brought into engagement' with the register rack 42andI will' thereafter he drivenby such.v racl alone, without any driyin` eieet from the gear'wheel, 3T. Any drivingeffect from the gear wheel 37 isv ohviated, during this period, by reason of the elearanee which exists between its relieved teeth and the teeth of the idler gear 35,

The operationot the press Ceseribed above7 as Constructed iin aeeordanee with my invention, is therefore, as follows:

Vitl'r the parts in the position shown in Fig. l, assumingthat the Cylinder has just begun its movement te the right and its partial gear #l1 has just come into mesh with the extending end, or lap, or the reg'- ister rack ft2, the iirst of the gradually relieved teeth b will have passed into mesh with theidler `gear 36, and the lirst oit the :fully relieved teeth e will be just about to mesh with said idler gear, :is the printingpart et the eyele commences. Owing to the relier-Jing oi these teeth the gear wheel 3T will not have any driving eilieet upon the Cylinder, the rotation et the eylinder, at this time, being efteetedI solely by the engagement et the register rael'; with the partial gear lll. Thus a highly accurate rolling` conta/et ot hed and: cylinder, during the printing portion ot the Cycle, is oh tained. During the dwellv periods7 `full-size teeth of the gear wheel 37 are engaged by the idle gear 56a. urin` the return re eiproeation et the cylinder, the engagement et the teeth of the idler gear 36 with the relieved teeth et thev gear wheel 37 is sailieient to rotate the cylinder, asA also is the ease duringthe forward reeiproeation et the cylinder at those times when the hed thrown out oi`1 operative relation with the eylinder by theV use o'l'" the pedalr 33, or other 'iso/ Having thus t'ully described my said invention, what claim as new, and desire to secure by Letters Patent, is:

In a printing pressu a cylinder member; a hedinember; means for moving` one ol said members lateraliy with respeet to the. other, to eii'eet the printing operation; moans for moving one ot said meniihers transversely with respect tothe other separate said members duringT a portion ol' the Cycle; a gearing connection between said membersoperative oniy when iid members are in. a non-sepan VVd eend whereby said cylinder memher is Y when in suoli non-separated eonditifnil i separate gea-ring for rotating` l. "il

saidA ey said last-named gearing havine its teeth relieved to a progr so as to be operative when said geair'ig; connection is inoperat Te, but not opera ive eoincidentlywith said gearing conn i.

TAL ER H. SML 

